CN211567061U - Bakelite matrix grinding wheel drop method pressing forming die - Google Patents

Abstract

The utility model discloses a bakelite matrix emery wheel fall method press forming die. The problems that in the existing bakelite matrix grinding wheel forming process, the forming steps are complicated, and the matrix and the grinding material layer are not uniformly layered are solved. This mould contains the mould circle, clamping ring on the abrasive material layer, lower foundation ring on the abrasive material layer, pressure head on the substrate layer, substrate layer lower plate, control drop packing ring, and central positioning plug, the mould circle is located the outside, the coaxial foundation ring under the abrasive material layer that has cup jointed of bottom in it, the same axle sleeve of bottom is furnished with substrate layer lower plate in the lower foundation ring on the abrasive material layer, clamping ring on the abrasive material layer has been cup jointed to the interior top of mould circle coaxial, the same axle sleeve of top is furnished with pressure head on the substrate layer in the clamping ring on the abrasive material layer, control drop backing plate activity is inboard on clamping ring and lower foundation ring on the abrasive material layer, pressure head on shaping process and substrate layer, lower plate contacts. The mould can one shot hot briquetting, and the layering is obvious, can effectively guarantee base member and abrasive material layer bonding strength, has both shortened the shaping cycle, can guarantee bulk strength and product planarization again.

Description

Bakelite matrix grinding wheel drop method pressing forming die

Technical Field

The utility model relates to a bakelite matrix emery wheel drop method press forming die.

Background

At present, most of the existing small-specification bakelite matrix grinding wheels are formed by firstly carrying out semi-hot pressing on a grinding layer, then cooling a mould and demoulding, then resin liquid is coated on the contact surface of the abrasive layer and the bakelite matrix, and finally the bakelite matrix is molded by hot pressing, but the method has more forming steps, the resin liquid can be coated only by cooling the abrasive layer, although obvious layering can be ensured, the forming period is longer, and because the abrasive layer and the substrate layer rely more on the solidification of the resin liquid to realize the bonding strength during the use process, in the actual use process, if the grinding wheel is not tightly clamped, the interface curing strength is influenced by overlarge axial feeding force or the temperature rise of the grinding material layer after long-time grinding, these all can cause the emery wheel breakage during high-speed operation, and cracked emery wheel piece flies out at a high speed under centrifugal force effect, easily injures people or other article, causes personnel's injury and economic loss.

Because prior art forming means is loaded down with trivial details, the product outward appearance is relatively poor, can not avoid the material cluster each other between matrix layer and the abrasive material layer interface to and can not guarantee the effectual bonding strength of abrasive material layer and matrix layer. Based on the above situation, the actual production needs cannot be satisfied, and therefore, improvements are necessary.

Disclosure of Invention

The utility model overcomes in the current bakelite base member emery wheel forming process, the shaping step is numerous and diverse, the phenomenon that base member and abrasive material layer layering are uneven, provides the convenient, simple structure's of suppression bakelite base member emery wheel drop method forming die, utilizes this mould to carry out the press forming, can effectively guarantee that abrasive material layer and base member layer layering are obvious, can guarantee that bakelite layer and abrasive material layer have sufficient bonding strength.

The utility model adopts the following technical scheme:

a bakelite matrix grinding wheel drop method press forming die comprises a die ring, an upper pressing ring of an abrasive layer, a lower bottom ring of the abrasive layer, an upper pressing head of a matrix layer, a lower bottom plate of the matrix layer, a gasket and a positioning core rod.

The utility model discloses in, the thickness of gasket is located between the thickness of the abrasive material layer of bakelite base member emery wheel and the inboard thickness of the lower base circle of abrasive material layer, when guaranteeing the die filling, base member layer lower plate can with under the abrasive material layer under base circle, the abrasive material layer clamping ring form confined abrasive material layer cavity. The upper surface of the lower bottom ring of the abrasive layer is provided with an inclined plane, the inner side of the inclined plane is high, and the outer side of the inclined plane is low, so that the thickness of the inner side (namely, the side close to the positioning core rod) of the inclined plane is larger.

The utility model discloses in, the inboard thickness of circle under the abrasive material layer is unanimous with the thickness of base member layer bottom plate, and base member layer bottom plate is the homogeneous thickness.

The utility model discloses in, the diameter of gasket is 95 ~ 99% of the lower base circle internal diameter of abrasive material layer, both can the activity dismantle convenient, can the atress even again.

The utility model discloses in, the location plug is cylindrical. The specific position relation (inside and outside, up and down) of the utility model is based on the position relation of the mould during the actual production, the thickness of each part is not limited, and the thickness is determined according to the actual production condition, thus the effect realization of the falling method pressing is not influenced; meanwhile, as a common knowledge, all the parts are of symmetrical structures and are symmetrical about the positioning core rod, and in the bakelite matrix grinding wheel drop method press forming die obtained by combining all the parts, the upper surface is a horizontal plane, and the lower surface is a horizontal plane.

The utility model discloses in, the external diameter of pressure head, base member layer bottom plate on the base member layer is unanimous with the lower base plate internal diameter on abrasive material layer respectively.

The utility model discloses in, the internal diameter, the external diameter of lower foundation ring of clamping ring, abrasive material layer on the abrasive material layer are unanimous.

The utility model discloses in, the internal diameter of mould circle is unanimous with the external diameter of clamping ring on the abrasive material layer, and the mould circle can entangle clamping ring, abrasive material layer under the backing ring on the abrasive material layer.

The utility model discloses in, the internal diameter of pressure head is unanimous on the external diameter of location plug and the base member layer, and the internal diameter of pressure head, base member layer lower plate is unanimous on the base member layer.

In the utility model, the lower surface of the upper clamping ring of the abrasive layer is an inclined plane, and the upper surface of the lower bottom ring of the abrasive layer is an inclined plane; the lower surface of the upper pressing ring of the abrasive layer is parallel to the upper surface of the lower bottom ring of the abrasive layer; preferably, the included angle degree between the lower surface of the clamping ring on the grinding material layer and the horizontal plane is 15-25 degrees, and in order to meet the practical application of the grinding wheel, when the front angle of the woodworking saw blade is processed, the cutter can be conveniently moved in and out between two teeth of the saw blade. On the other hand, when the grinding wheel is prepared by hot pressing, the interface contact between the grinding material layer and the base layer is better due to the limitation of the angle, and the problems of poor layering and poor reactivity of the interface due to gravity caused by overhigh angle are avoided.

In the utility model, the lower surface of the pressure head on the substrate layer is of a Z-shaped structure, the upper side of the Z-shaped structure is of a plane structure, and the lower side of the Z-shaped structure is of an inclined structure, so that the lower edge of the inclined structure is the lower surface edge of the pressure head on the substrate layer, which indicates that the lower surface of the pressure head on the substrate layer is not all inclined planes, and the area of the inclined structure occupying the lower surface of the pressure head on the substrate layer is not limited; preferably, the included angle degree of the inclined structure and the horizontal plane is 15-25 degrees, and further preferably, the included angle degree is kept consistent with the inclined degree of the abrasive layer, so that the grinding wheel is convenient to form and process. As common sense, Z type structure comprises the waist of the higher authority, lower authority and connection higher authority lower authority, the utility model discloses do not do the restriction to the parameter of waist, do not influence the utility model discloses the realization of effect is injectd the higher authority and is plane, lower authority for the slope, can confirm the position and the structure of waist according to the position of upper and lower authority.

The method for preparing the bakelite matrix grinding wheel by utilizing the bakelite matrix grinding wheel drop method press forming die comprises the following steps of:

(1) placing a pad in the lower bottom ring of the abrasive layer, then placing a lower bottom plate of the substrate layer on the pad, then sleeving a die ring on the outer side of the lower bottom ring of the abrasive layer, then feeding abrasive raw materials, scraping materials and installing an upper pressing ring of the abrasive layer; then cold pressing and pressing; according to the structure of the die, the abrasive raw material is positioned between the lower bottom ring of the abrasive layer and the upper pressing ring of the abrasive layer, and between the die ring and the lower bottom plate of the base layer;

(2) placing the positioning core rod on the gasket; then adding glue wood, scraping and installing an upper pressure head of the substrate layer; then preheating after cold pressing; according to the die structure, the bakelite material is positioned between the lower base plate of the base layer and the upper pressure head of the base layer, and between the upper pressing ring of the grinding material layer and the positioning core rod;

(3) and placing the gasket on a pressure head on the base layer, and then carrying out hot press molding to obtain the small-specification bakelite base grinding wheel.

The steps of the preparation method are carried out in sequence, and the preparation method specifically comprises the following steps:

the first step is as follows: assembling the die, forming an abrasive layer cavity, feeding and pressing. Placing a lower bottom ring of the abrasive layer, placing a fall backing plate on the inner side of the lower bottom ring and sleeving a lower bottom plate of the substrate layer to ensure that the lower bottom plate is in contact with the backing plate, then sleeving a die ring on the outer side of the lower bottom ring of the abrasive layer, feeding, scraping and installing an upper pressing ring of the abrasive layer to finish cold pressing;

the second step is that: and feeding and pressing the bakelite matrix layer. Installing a middle core rod of the die in place, feeding adhesive wood into the cavity of the matrix layer, and sleeving a pressing head on the matrix layer to finish cold pressing;

the third step: and integrally placing the hot press and preheating. The materials in two independent chambers of the abrasive layer and the substrate layer are partially softened, and gaps in each layer are extruded;

the fourth step: the hot press releases pressure, and a fall backing plate (namely a gasket) is placed on the base layer to complete hot press molding by a pressure head. And starting the hot press to relieve pressure, placing a fall backing plate in the die above a pressure head on the substrate layer, restarting the hot press to perform hot pressing until the molding is completed, wherein the process can ensure that the grinding material layer is in contact with the substrate layer after resetting, and contact interfaces are bonded together.

The utility model discloses in, the bakelite base member emery wheel is small dimension bakelite base member emery wheel.

The utility model discloses the mould comprises pressure head, base plate, gasket, location mandrel under the base plate on base member layer under clamping ring, abrasive material layer on by the diaphragm, the abrasive material layer. The mold ring is positioned on the outermost side, the inner bottom of the mold ring is coaxially sleeved with a lower abrasive layer bottom ring, the inner bottom of the lower abrasive layer bottom ring is coaxially sleeved with a lower substrate layer bottom plate, the inner top of the mold ring is coaxially sleeved with an upper abrasive layer pressing ring, the inner top of the upper abrasive layer pressing ring is coaxially sleeved with an upper substrate layer pressing head, and the lower substrate layer bottom plate and the upper substrate layer pressing head can move up and down on the upper abrasive layer pressing ring and the lower abrasive layer bottom ring; the gasket is movably arranged on the upper pressing ring and the inner side of the lower bottom ring of the grinding material layer, the matching is loose, and the forming process is contacted with the upper pressing head and the lower bottom plate of the base layer.

Compared with the prior art, the utility model discloses the shaping of bakelite emery wheel embossing mold drop has following advantage: compared with the existing mold, the abrasive layer and the substrate layer are provided with independent molding cavities, so that one-time mold filling can be completed, and one-time hot press molding can be realized; in the preheating stage before hot pressing, the grinding material layer and the inner part of the base body layer are extruded, the inner gap is released, and no material mixing is possible after resetting and hot pressing, so that the layering is obvious. The constitution formula to current conventional bakelite base member emery wheel, the utility model discloses the shaping mode is in the same place because abrasive material layer and base member in situ portion all are through phenolic resin cross-linking solidification, combines to compare with applying paint the resin liquid with a brush and can effectively guarantee base member and abrasive material layer bonding strength. Not only shortens the molding cycle, but also ensures the integral strength and the product aesthetic property.

Drawings

Fig. 1 is a schematic view of a overlooking structure of a bakelite matrix grinding wheel drop method press forming die of the present invention;

FIG. 2 is a schematic diagram of the dimension structure of the bakelite matrix grinding wheel drop-out method press forming die of the present invention;

FIG. 3 is a schematic structural view (mold loading view) of the bakelite grinding wheel drop height compacting mold of the present invention;

FIG. 4 is a structural diagram of the bakelite grinding wheel drop height compacting die at the preheating stage of the utility model;

FIG. 5 is a schematic structural view of the bakelite grinding wheel drop height compacting die at the resetting and hot-pressing stage of the utility model;

FIG. 6 is a schematic view of a grinding wheel according to a second embodiment;

in the description of the drawing, reference numeral 1 is a die ring, 2 is an upper pressing ring of an abrasive layer, 3 is a lower bottom ring of the abrasive layer, 4 is an upper pressing head of a substrate layer, 5 is a lower bottom plate of the substrate layer, 6 is a pad for controlling drop height, 7 is a positioning core rod, 8 is an inclined structure of the lower bottom plate of the substrate layer, 9 is a lower surface inclined plane of the upper pressing ring of the abrasive layer, and 10 is an upper surface inclined plane of the lower bottom ring of the abrasive layer. The repeated or symmetrical parts are marked with one place, which does not influence the understanding of the technicians in the field.

Detailed Description

The bakelite grinding wheel drop compacting die of the present invention will be further described with reference to the accompanying drawings and the specific embodiments.

Example one

As shown in fig. 1-2, the bakelite matrix grinding wheel drop method press forming die is composed of a die ring 1, an abrasive layer upper pressing ring 2, an abrasive layer lower bottom ring 3, a matrix layer upper pressing head 4, a matrix layer lower bottom plate 5, a gasket 6 (for controlling drop height), and a positioning core rod 7 (for center positioning), wherein the positioning core rod is cylindrical.

The bakelite matrix grinding wheel is a small-specification bakelite matrix grinding wheel, and the specific specification parameters are 12V2/20 and 125X 14X 32X 12X 1 (outer diameter X total thickness X middle hole X grinding layer width X straight edge thickness, mm).

The thickness of the gasket is 10 mm; the thickness of the inner side of the lower ring of the abrasive layer and the thickness of the lower ring of the base layer are both 14 mm; the diameter of the gasket is 98 mm; the inner diameter of the lower bottom ring of the abrasive layer is 101 mm; the outer diameter of the lower bottom ring of the abrasive layer is 125.5mm (0.5 mm is added as grinding allowance); the outer diameter of a pressure head on the substrate layer is 101 mm; the outer diameter of the positioning core rod is 16 mm; the outer diameter of the positioning core rod is consistent with the aperture of the pressure head on the base body layer.

The inner diameter and the outer diameter of the lower bottom ring of the abrasive layer are consistent with the inner diameter and the outer diameter of the upper pressing ring of the abrasive layer; the outer diameter of the lower base plate of the substrate layer is consistent with the outer diameter of the upper pressure head of the substrate layer; the inner diameter of the die ring is consistent with the outer diameter of the upper clamping ring of the abrasive layer, and the die ring can be sleeved on the upper clamping ring of the abrasive layer and the lower bottom ring of the abrasive layer; all the parts are tightly combined under the action of the die ring, and the pressing requirement is met.

The mold ring is located the outside, and the coaxial under-lap that has cup jointed abrasive material layer in its bottom, and the same axle sleeve of bottom is furnished with base layer lower plate in the under-lap of abrasive material layer, and the clamping ring on the abrasive material layer has coaxially been cup jointed at the interior top of mold ring, and the same axle sleeve in the top is furnished with the pressure head on the base layer on the clamping ring on the abrasive material layer, and the pressure head can be in the inside activity from top to bottom of clamping ring and abrasive material layer under the abrasive material layer on base layer lower plate and the base layer. The gasket is movably arranged on the upper pressing ring of the grinding material layer and on the inner side of the lower bottom ring of the grinding material layer, the matching is loose, and the forming process is respectively contacted with the upper pressing head of the base layer and the lower bottom plate of the base layer.

The lower surface of the upper pressing ring of the abrasive layer is an inclined plane 9, the upper surface of the lower bottom ring of the abrasive layer is an inclined plane 10, and the inner side of the inclined plane is high, and the outer side of the inclined plane is low; the lower surface of the upper pressing ring of the abrasive layer is parallel to the upper surface of the lower bottom ring of the abrasive layer; the included angle between the lower surface of the pressing ring on the abrasive layer and the horizontal plane is 20 degrees, when the prepared grinding wheel is used for processing the front angle of the cutting bit of the woodworking saw blade, the prepared grinding wheel can not touch other parts of the saw blade, enough tool feeding and retracting allowance is left for grinding and processing of the grinding wheel, the practical application of the grinding wheel is facilitated, the limit of the degree can ensure that the influence of gravity on a polymer in a viscous flow state is slightly small when the interface reaction is generated between the matrix layer and the abrasive layer through hot pressing, and the guarantee is provided for obvious layering and good interface reaction; and the structure has a certain inclined plane structure which is low outwards, so that the improvement of the interface reaction effect of the bakelite matrix and the abrasive layer can be facilitated.

The lower surface of the pressing head on the substrate layer is of a Z-shaped structure, the upper edge of the Z-shaped structure is of a plane structure, and the lower edge of the Z-shaped structure is of an inclined structure 8, so that the lower edge of the inclined structure is the lower surface edge of the pressing head on the substrate layer, the lower surface of the pressing head on the substrate layer is not all inclined planes, the included angle degree between the inclined structure and the horizontal plane is 20 degrees, and the included angle degree is consistent with the inclined degree of the grinding material layer, and the grinding wheel is convenient to; the Z type structure comprises the waist of the higher authority, lower level and connection higher authority lower authority, the utility model discloses do not injecing, not influencing to the parameter of waist, the specific length of lower authority the utility model discloses the realization of effect is injecing the higher authority and is plane, lower level for the slope, can confirm the position and the structure of waist according to the position of upper and lower limit.

The specific position relation (inside and outside, up and down) of the utility model is based on the position relation of the mould during the actual production, the thickness of each part is not limited, and the thickness is determined according to the actual production condition, thus the effect realization of the falling method pressing is not influenced; meanwhile, as a common knowledge, all the parts are of symmetrical structures and are symmetrical about the positioning core rod, and in the bakelite matrix grinding wheel drop method press forming die obtained by combining all the parts, the upper surface is a horizontal plane, and the lower surface is a horizontal plane.

Example two

Preparing a small-specification bakelite matrix grinding wheel by using the mold of the first embodiment, wherein the included angle between the lower surface of the pressing ring on the abrasive layer and the horizontal plane is 20 degrees; the included angle degree between the inclined structure and the horizontal plane is 20 degrees. The bakelite matrix grinding wheel is a small-specification bakelite matrix grinding wheel, and the specific specification parameters are 12V2/20 and 125X 14X 32X 12X 1 (outer diameter X total thickness X middle hole X grinding layer width X straight edge thickness, mm).

The formula of the abrasive layer in the embodiment comprises the following raw materials in parts by weight: 35 parts of phenolic resin powder, 45 parts of copper powder, 3 parts of zinc oxide, 15 parts of silicon carbide, 2 parts of molybdenum disulfide and 2 parts of calcium oxide. The substrate layer adopts Sumitomo brand glass fiber reinforced bakelite powder.

The method for preparing the small-specification bakelite matrix grinding wheel comprises the following steps:

the first step is as follows: and assembling the mold, forming an abrasive layer cavity and feeding. Placing a lower bottom ring of an abrasive layer, placing a gasket on the inner side of the lower bottom ring and sleeving a lower bottom plate of the base layer to ensure that the lower bottom plate of the base layer is in contact with the gasket, then sleeving a mold ring on the outer side of the lower bottom ring of the abrasive layer, feeding (feeding after mixing raw materials of the abrasive layer), scraping and installing an upper pressing ring of the abrasive layer; according to the structure of the die, the abrasive raw material is positioned between the lower bottom ring of the abrasive layer and the upper pressing ring of the abrasive layer, and between the die ring and the lower bottom plate of the base layer; see fig. 3;

the second step is that: and feeding the bakelite matrix layer. Inserting a mold positioning core rod into a central hole of a lower base plate of the matrix layer, attaching the mold positioning core rod to a gasket, feeding bakelite into a cavity of the matrix layer, and sleeving an upper pressing head of the matrix layer; according to the die structure, the bakelite material is positioned between the lower base plate of the base layer and the upper pressure head of the base layer, and between the upper pressing ring of the grinding material layer and the positioning core rod;

the third step: the whole mould is placed in a hot press (Zhengzhou three-grinding MY 630) for preheating. Partially softening the materials in the two independent chambers of the grinding material layer and the substrate layer, and extruding the gaps in each layer; in the preheating process, the temperature of a press is set to be 160 ℃, the preheating time is 2min, the pressure is 120kN, and the total pressure is 4 MPa; see fig. 4;

the fourth step: starting the hot press to release pressure, taking out the gasket in the die, directly placing the gasket above a pressure head on the substrate layer, and restarting the hot press to perform hot pressing until the molding is finished; the process can ensure that the grinding material layer is contacted with the substrate layer after reset, and contact interfaces are bonded together; in the hot pressing process, the temperature is 170 ℃, the forming pressure is 300kN, the total pressure is 10MPa, and the hot pressing time is 15 min; see fig. 5.

The existing mold for comparison firstly semi-hot-presses the abrasive layer, then cools the mold and releases the mold, then paints resin liquid on the contact surface of the abrasive layer and the bakelite matrix, and then puts the resin liquid and the bakelite matrix into the mold for hot-press molding.

The drop method is adopted for compression molding, so that the molding period of the product can be effectively shortened, the grinding wheel with the same formula and specification is prepared, and the whole consumed time of the mold of the utility model is about 65 percent of that of the existing mold; and the finished product grinding wheel has a firm structure and obvious layering.

FIG. 6 is a schematic structural view of the small-sized bakelite matrix grinding wheel. The bakelite matrix grinding wheel is formed and pressed by adopting the drop-out method, so that the interface of the grinding material layer and the matrix layer is effectively ensured to be regular and round; in the same formula, the grinding wheel prepared by the existing mould has a fuzzy interface between a grinding material layer and a base layer and has an obvious material channeling phenomenon.

The small-specification bakelite matrix grinding wheel prepared by the same formula and the small-specification bakelite matrix grinding wheel prepared by the existing die are sent to a customer for testing, the same processing parameters and processing products are adopted, and within 10 hours, the number of laps of the small-specification bakelite matrix grinding wheel prepared by the utility model is 0, and the number of laps of the small-specification bakelite matrix grinding wheel prepared by the existing die is 6; the small-specification bakelite matrix grinding wheel prepared by the utility model has no crack phenomenon, and the small-specification bakelite matrix grinding wheel prepared by the existing die has cracks although individual small-specification bakelite matrix grinding wheel is not broken; the small-sized bakelite matrix grinding wheel prepared by the utility model has firm structure. If the included angle between the lower surface of the clamping ring on the abrasive layer in the first embodiment and the horizontal plane and the included angle between the inclined structure and the horizontal plane are adjusted to 35 degrees, and the rest are unchanged, the small-specification bakelite matrix grinding wheel prepared by the method in the second embodiment is sent to a customer for testing, the same processing parameters and processing products are adopted, and the number of grinding wheel off-turns is 2 within 10 hours.

Claims (10)

1. The bakelite matrix grinding wheel drop method pressing forming die is characterized by comprising a die ring, an upper pressing ring of an abrasive layer, a lower bottom ring of the abrasive layer, an upper pressing head of a matrix layer, a lower bottom plate of the matrix layer, a gasket and a positioning core rod.

2. The offset press forming die for the bakelite matrix grinding wheel according to claim 1, wherein the thickness of the gasket is between the thickness of the abrasive layer of the bakelite matrix grinding wheel and the thickness of the inner side of the lower bottom ring of the abrasive layer; the thickness of the inner side of the lower ring of the abrasive layer is consistent with that of the lower ring of the base layer.

3. The offset press molding die for the bakelite matrix grinding wheel according to claim 1, wherein the diameter of the gasket is 95 to 99 percent of the inner diameter of the lower bottom ring of the abrasive layer.

4. The offset press molding die for the bakelite matrix grinding wheel according to claim 1, wherein the positioning core rod is cylindrical, and the outer diameter of the positioning core rod is consistent with the inner diameter of the lower base plate of the matrix layer and the outer diameter of the upper pressing head of the matrix layer.

5. The die for press forming of the bakelite matrix grinding wheel by the drop method according to claim 1, wherein the outer diameters of the upper pressing head of the matrix layer and the lower base plate of the matrix layer are respectively consistent with the inner diameter of the lower base ring of the grinding material layer; the inner diameter of the die ring is consistent with the outer diameter of the pressing ring on the abrasive material layer.

6. The bakelite matrix grinding wheel drop-method press-forming mold according to claim 1, wherein the inner diameter and the outer diameter of the upper pressing ring of the abrasive layer and the lower bottom ring of the abrasive layer are consistent; the inner diameter of the upper pressure head of the substrate layer is consistent with the inner diameter of the lower bottom plate of the substrate layer.

7. The differential pressure forming die for the bakelite matrix grinding wheel according to claim 1, wherein the lower surface of the upper pressing ring of the abrasive layer is an inclined surface, and the upper surface of the lower backing ring of the abrasive layer is an inclined surface.

8. The bakelite matrix grinding wheel drop height press forming mold according to claim 7, wherein the lower surface of the upper clamping ring of the abrasive layer is parallel to the upper surface of the lower backing ring of the abrasive layer; the included angle degree between the lower surface of the pressing ring on the abrasive layer and the horizontal plane is 15-25 degrees.

9. The offset press molding die for the bakelite matrix grinding wheel according to claim 1, wherein the lower surface of the upper pressing head of the matrix layer is of a Z-shaped structure, the upper side of the Z-shaped structure is of a plane structure, and the lower side of the Z-shaped structure is of an inclined structure.

10. The slip press forming die for the bakelite matrix grinding wheel according to claim 9, wherein the included angle between the inclined structure and the horizontal plane is 15 to 25 degrees.

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